[openfirmware] r1539 - cpu/x86/pc/olpc
svn at openfirmware.info
svn at openfirmware.info
Sun Dec 6 07:18:02 CET 2009
Author: wmb
Date: 2009-12-06 07:18:01 +0100 (Sun, 06 Dec 2009)
New Revision: 1539
Added:
cpu/x86/pc/olpc/sba.fth
Log:
Initial checkin of sba.fth
Added: cpu/x86/pc/olpc/sba.fth
===================================================================
--- cpu/x86/pc/olpc/sba.fth (rev 0)
+++ cpu/x86/pc/olpc/sba.fth 2009-12-06 06:18:01 UTC (rev 1539)
@@ -0,0 +1,69 @@
+\ See license at end of file
+purpose: Subrange device to access Secure Boot Area between boot record and first partition
+
+d# 512 constant /sector
+/sector instance buffer: sector-buf
+
+0 instance 2value image-size
+0 instance 2value seek-ptr
+external
+\ Expose for the OLPC security scheme
+0 instance 2value offset
+
+: clip-size ( adr len -- adr len' )
+ u>d seek-ptr d+ ( adr d.endptr )
+ 2dup image-size d> if ( adr d.endptr )
+ 2drop image-size ( adr d.endlimit )
+ then ( adr d.endlimit )
+ seek-ptr d- drop ( adr len' )
+;
+: update-ptr ( len' -- len' ) dup u>d seek-ptr d+ to seek-ptr ;
+
+: ptable-adr ( -- start ) sector-buf h# 1be + ;
+
+: open ( -- flag )
+ sector-buf /sector " read" $call-parent /sector <> if false exit then
+ sector-buf h# 1fe + le-w@ h# aa55 <> if false exit then \ FDisk?
+ ptable-adr 4 + c@ 7 <> if false exit then \ NTFS?
+ ptable-adr 8 + le-l@ /sector um* to image-size
+ h# 10 /sector um* to offset
+ true
+;
+
+external
+: seek ( d.offset -- status )
+ 2dup image-size d> if 2drop true exit then \ Seek offset too big
+ to seek-ptr
+ seek-ptr offset d+ " seek" $call-parent
+;
+: size ( -- d.size ) image-size ;
+: read ( adr len -- actual )
+ clip-size ( adr len' )
+ " read" $call-parent ( len' )
+ update-ptr ( len' )
+;
+
+
+\ LICENSE_BEGIN
+\ Copyright (c) 2009 FirmWorks
+\
+\ Permission is hereby granted, free of charge, to any person obtaining
+\ a copy of this software and associated documentation files (the
+\ "Software"), to deal in the Software without restriction, including
+\ without limitation the rights to use, copy, modify, merge, publish,
+\ distribute, sublicense, and/or sell copies of the Software, and to
+\ permit persons to whom the Software is furnished to do so, subject to
+\ the following conditions:
+\
+\ The above copyright notice and this permission notice shall be
+\ included in all copies or substantial portions of the Software.
+\
+\ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+\ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+\ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+\ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+\ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+\ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+\ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+\
+\ LICENSE_END
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